Sv: Sv: Sv: Avoid duplicate emails in the sent folder

[Sebastian]

Also another important thing to take in consideration:

An email that is sent outgoing from an SMTP server, isn't a exact copy of the email put into the SMTP server.
Thats why a deduplicate program/command/filter won't work, as the 2 emails aren't 100% identical.

The 2 "duplicates" arent technically 100% identical. Thats why the only solution is to prevent the IMAP client from writing new "unknown" emails into the Sent folder, and then instead use a separate folder for importing emails across accounts (from which you then COPY/MOVE emails from internally in the same acount, to the Sent folder).

-----Ursprungligt meddelande-----
Från: dovecot-bounces at dovecot.org <dovecot-bounces at dovecot.org> För André Rodier
Skickat: den 4 april 2021 14:10
Till: Dovecot Mailing List <dovecot at dovecot.org>
Ämne: Re: Sv: Sv: Avoid duplicate emails in the sent folder

Hello Sebastian,

On Sun, 2021-04-04 at 14:00 +0200, Sebastian wrote:
> Thats why you need the exim4 filter too.

I obtained the exact same result with postfix, using +Sent and a sieve filter. Sent emails are automatically bcc'ed to the user, using the
+Sent email address.

However, I still want to be able to drag and drop emails to the sent folder, which unfortunately uses the APPEND verb.

Also, there is a mail import wizard that import emails from gmail/yahoo/etc, and there the verb used is APPEND.

I am now investigating the doveadm deduplicate program.

Kind regards,
André

> Because, my version basically prohibits the IMAP client from writing 
> to the Sent folder at all, and gives that job to the SMTP server 
> instead.
> Works perfectly for me, all sent emails gets into the sent folder 
> without any hitch.
> 
> Without any duplicates since no IMAP client is permitted to write into 
> the Sent folder.
> 
> Note that only APPEND should be specifyed, not COPY, meaning that if 
> you COPY from the same IMAP account to Sent folder, it will be 
> permitted, but if you APPEND (write a new email) to the Sent folder, 
> it will get auto-deleted.
> 
> -----Ursprungligt meddelande-----
> Från: dovecot-bounces at dovecot.org <dovecot-bounces at dovecot.org> För 
> André Rodier
> Skickat: den 4 april 2021 13:57
> Till: Dovecot Mailing List <dovecot at dovecot.org>
> Ämne: Re: Sv: Avoid duplicate emails in the sent folder
> 
> Thanks, Sebastian.
> 
> I just tried this, but it is working too well.
> 
> If I want to import emails from another Sent folder, using drag & drop 
> from my email client, the emails are deleted in the background.
> 
> This is why I am trying to use the duplicate filter.
> 
> Kind regards,
> André Rodier
> 
> On Sun, 2021-04-04 at 13:04 +0200, Sebastian wrote:
> > I have a sieve filter called "sent.sieve"
> > 
> > Where I just do this:
> > discard;
> > 
> > Then in sieve settings:
> > 
> > plugin {
> >   sieve_plugins = sieve_imapsieve sieve_extprograms
> >   sieve_global_extensions = +vnd.dovecot.execute
> >   sieve_execute_bin_dir = /usr/bin/
> >   imapsieve_mailbox2_name = Sent
> >   imapsieve_mailbox2_causes = APPEND
> >   imapsieve_mailbox2_before = file:/etc/dovecot/sieve/sent.sieve
> >   imapsieve_expunge_discarded=yes
> > }
> > 
> > 
> > And then in Exim4 SMTP server:
> > 
> > 
> > sentfolder.filter:
> > if $sender_address_domain is sebbe.eu then unseen save 
> > /var/mail/asterisk2/Sent endif
> > 
> > in exim4 config:
> > system_filter = /etc/exim4/sentfolder.filter 
> > system_filter_file_transport = sentfolder
> > 
> > in transports of exim4.conf:
> > 
> > sentfolder:
> >   debug_print = "T: Sentfolder for $local_part@$domain"
> >   headers_add = Status: RO
> >   headers_remove = x-dkim-signature
> >   headers_remove = x-spf-signature
> >   headers_remove = x-trusted-domain
> >   headers_remove = keywords
> >   headers_remove = x-priority
> >   headers_remove = x-status
> >   driver = appendfile
> >   delivery_date_add
> >   envelope_to_add
> >   return_path_add
> >   use_flock_lock = yes
> >   use_fcntl_lock = no
> >   use_lockfile = no
> >   group = mail
> >   mode = 0777
> >   mode_fail_narrower = false
> >   current_directory = /
> > 
> > 
> > 
> > that should solve it.
> > 
> > -----Ursprungligt meddelande-----
> > Från: dovecot-bounces at dovecot.org <dovecot-bounces at dovecot.org> För 
> > André Rodier
> > Skickat: den 4 april 2021 12:48
> > Till: dovecot at dovecot.org
> > Kopia: users at sogo.nu
> > Ämne: Avoid duplicate emails in the sent folder
> > 
> > Hello,
> > 
> > I have a webmail program, that I cannot configure to not save sent 
> > emails in the Sent folder. My emails to the SOGo team don't seem to 
> > reach the mailing list anymore.
> > 
> > So, I have no other choice to think the problem differently, and 
> > _maybe_ use Dovecot to fix this issue. Moreover, I think this could 
> > be useful for other email clients.
> > 
> > First, I have tried to use Sieve, but no success so far:
> > 
> > ------
> > imapsieve_mailbox4_name = *
> >   imapsieve_mailbox4_from = Sent
> >   imapsieve_mailbox4_causes = APPEND, COPY
> >   imapsieve_mailbox4_after = file:/var/lib/dovecot/sieve/sent- 
> > checks.sieve
> > ------
> > 
> > And this sieve script:
> > 
> > ------
> > Message-ID header.
> > require [
> >   "variables",
> >   "environment",
> >   "duplicate",
> >   "imapsieve"
> > ];
> > 
> > […]
> > 
> > if duplicate :seconds 10 {
> >    discard;
> > }
> > ------
> > 
> > Otherwise, can I configure dovecot in a certain way, for instance 
> > create a virtual Sent folder. This would not save the email when 
> > appended, but still returns the list of sent emails ?
> > 
> > But this is not working. Any idea?
> > 
> > Thanks for your help!
> > 
> > André
> > 
> > 
> 
> 


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